# 2010 United States Senate election in Wisconsin

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vte :
The 2010 United States Senate election in Wisconsin was held on November 2, 2010. Incumbent Democratic Senator Russ Feingold lost re-election to a fourth term to Republican challenger Ron Johnson, a businessman and first-time candidate. Johnson was the first Republican to win a Senate election in Wisconsin since 1986. Feingold also became the fifth senator in a row from Wisconsin's Class 3 Senate seat to be defeated for re-election in the general election, and the seventh in a row overall to lose by a defeat in either the primary or general elections. Johnson was re-elected in 2016 in a rematch with Feingold.

## Republican primary
### Candidates

On the ballot
* Stephen Finn, plumber
* Ron Johnson, businessman
* Dave Westlake, businessman
Declined
* Ted Kanavas, state senator
* Dick Leinenkugel (dropped out), former State Commerce Secretary
* Tommy Thompson, former governor of Wisconsin
* Terrence Wall (dropped out), real estate developer

### Campaign

Former Republican Governor of Wisconsin Tommy Thompson had expressed an interest in challenging Feingold, but ruled himself out of the race in April 2010.
Johnson, a millionaire manufacturer and Tea Party movement favorite running for political office for the first time, was the frontrunner. In response to controversy over his ownership of stock in BP, Johnson said he would sell it when market conditions were favorable and possibly use the proceeds to help finance his Senate campaign. Johnson was endorsed by: the Club for Growth, a fiscally conservative advocacy organization; former Wisconsin Republican Lt. Governor Margaret Farrow; Republican U.S. Senator Jim DeMint of South Carolina; and Wisconsin Republican U.S. Representatives Jim Sensenbrenner, Tom Petri and Paul Ryan. Businessman David Westlake was endorsed by the Republican Liberty Caucus. According to OpenSecrets, as of August 25, 2010, Johnson had invested $4.3 million of his own money into his campaign; this amount represented 71 percent of his campaign funds, while 27 percent of his campaign funds ($1.6 million) came from individual contributions.

### Polling

| Poll Source | Date(s) administered | Sample size | Margin of error | Ron Johnson | Dave Westlake | Other | Undecided |
| Public Policy Polling (report) | June 26–27, 2010 | 400 | ± 4.9% | 49% | 11% | –– | 40% |

### Results

Republican Primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Ron Johnson | 500,821 | 84.7% |
| | Republican | David Westlake | 61,287 | 10.4% |
| | Republican | Stephen M. Finn | 29,002 | 4.9% |
| Total votes | Total votes | Total votes | 591,107 | 100.0% |

## General election
### Candidates

* Russ Feingold (D), incumbent U.S. senator
* Ron Johnson (R), businessman
* Dave Rutowski (I)
* Rob Taylor (I) self-described Constitution Party candidate

### Campaign

Feingold's first television ad was a positive ad released in March. In July 2010, Feingold's second 2010 television election ad attacked Johnson for alleged support for offshore drilling in the Great Lakes. Johnson quickly countered Feingold with a television ad of his own. Feingold's logo was Moving Forward. In one ad, he emphasized independence and called himself a "penny pincher." Johnson argued that manufacturers and accountants were underrepresented in the U.S. Senate, and there were too many lawyers (57 out of 100 members, including Feingold). Feingold received the endorsements of the Milwaukee Journal Sentinel and the Green Bay Press-Gazette. The Beloit Daily News endorsed Johnson.

### Debates

* October 8 in Milwaukee
* October 11 in Wausau
* October 22 in Eau Claire on WQOW

### Predictions

| Source | Ranking | As of |
| Cook Political Report | Lean R (flip) | October 26, 2010 |
| Rothenberg | Lean R (flip) | October 22, 2010 |
| RealClearPolitics | Lean R (flip) | October 26, 2010 |
| Sabato's Crystal Ball | Lean R (flip) | October 21, 2010 |
| CQ Politics | Lean R (flip) | October 26, 2010 |

### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Russ Feingold (D) | Ron Johnson (R) | Other | Undecided |
| Rasmussen Reports | May 25, 2010 | 500 | ± 4.5% | 46% | 44% | 3% | 6% |
| Rasmussen Reports | June 21, 2010 | 500 | ± 4.5% | 46% | 45% | 3% | 6% |
| Public Policy Polling | June 26–27, 2010 | 638 | ± 3.9% | 45% | 43% | –– | 12% |
| Rasmussen Reports | July 13, 2010 | 750 | ± 4.0% | 46% | 47% | 2% | 6% |
| University of Wisconsin, Madison | July 15, 2010 | 500 | ± 3.9% | 33% | 28% | –– | 44% |
| Magellan Strategies | July 20, 2010 | 1,145 | ± 2.9% | 45% | 43% | 3.7% | 8% |
| Rasmussen Reports | July 27, 2010 | 500 | ± 4.0% | 46% | 48% | 2% | 5% |
| Rasmussen Reports | August 11, 2010 | 750 | ± 4.0% | 46% | 47% | 2% | 5% |
| Rasmussen Reports | August 24, 2010 | 750 | ± 4.0% | 46% | 47% | 1% | 5% |
| Rasmussen Reports | September 15, 2010 | 750 | ± 4.0% | 44% | 51% | 1% | 4% |
| Public Policy Polling | September 18–19, 2010 | –– | ± 3.8% | 41% | 52% | –– | 7% |
| CNN/Time/Opinion Research | September 17–21, 2010 | 963 | ± 3.0% | 45% | 51% | 2% | 2% |
| McClatchy/Marist | September 26–28, 2010 | 806 | ± 3.5% | 45% | 52% | 1% | 3% |
| Rasmussen Reports | September 29, 2010 | 750 | ± 4.0% | 42% | 54% | 2% | 2% |
| We the People | September 29 – October 4, 2010 | 400 | ± 5.0% | 41% | 49% | –– | –– |
| We the People/Ispos | October 8, 2010 | 400 | ± 5.0% | 44% | 51% | –– | –– |
| Rasmussen Reports | October 11, 2010 | 750 | ± 4.0% | 45% | 52% | –– | 2% |
| CNN/Time/Opinion Research | October 8–12, 2010 | 1,506 | ± 2.5% | 44% | 52% | 1% | –– |
| St. Norbert College/WPR | October 12–15, 2010 | 402 | ± 5.0% | 47% | 49% | –– | 4% |
| Rasmussen Reports | October 25, 2010 | 750 | ± 4.0% | 46% | 53% | 0% | 1% |
| We the People | October 24–27, 2010 | 400 | ± 5.0% | 44% | 48% | –– | 6% |
| Public Policy Polling | October 26–28, 2010 | 1,372 | ± 2.6% | 44% | 53% | –– | 3% |
| Marist College | October 26–28, 2010 | 811 | ± 4.5% | 45% | 52% | 1% | 2% |
| Poll source | Date(s) administered | Sample size | Margin of Error | Russ Feingold (D) | David Westlake (R) | Other | Undecided |
| Public Policy Polling (report) | June 26–27, 2010 | 638 | ± 3.9% | 45% | 38% | -- | 17% |
| Rasmussen Reports (report) | June 21, 2010 | 500 | ± 4.5% | 47% | 41% | 4% | 7% |
| Rasmussen Reports (report) | May 25, 2010 | 500 | ± 4.5% | 47% | 38% | 7% | 8% |
| Public Policy Polling (report) | March 23, 2010 | 700 | ± 3.7% | 48% | 31% | — | 21% |
| Rasmussen Reports (report) | March 16, 2010 | 500 | ± 4.5% | 51% | 35% | 5% | 10% |
| Rasmussen Reports (report) | February 17, 2010 | 500 | ± 4.5% | 47% | 37% | 6% | 10% |
| Public Policy Polling (report) | November 20–22, 2009 | 767 | ± 3.5% | 47% | 32% | — | 21% |
| Poll source | Date(s) administered | Sample size | Margin of Error | Russ Feingold (D) | Tommy Thompson (R) | Other | Undecided |
| WPRI (report) | September 27–29, 2009 | 700 | ± 3.8% | 39% | 43% | — | 18% |
| Public Policy Polling (report) | November 20–22, 2009 | 767 | ± 3.5% | 50% | 41% | — | 10% |
| Rasmussen Reports (report) | January 26, 2010 | 500 | ± 4.5% | 43% | 47% | 6% | 4% |
| Rasmussen Reports (report) | February 17, 2010 | 500 | ± 4.5% | 43% | 48% | 3% | 5% |
| WPRI (report) | March 9, 2010 | 600 | ± 4.0% | 39% | 51% | — | 9% |
| Rasmussen Reports (report) | March 16, 2010 | 500 | ± 4.5% | 45% | 47% | 3% | 4% |
| Public Policy Polling (report) | March 23, 2010 | 700 | ± 3.7% | 47% | 44% | — | 9% |
| Poll source | Date(s) administered | Sample size | Margin of Error | Russ Feingold (D) | Terrence Wall (R) | Other | Undecided |
| Public Policy Polling (report) | November 20–22, 2009 | 767 | ± 3.5% | 48% | 34% | — | 19% |
| Rasmussen Reports (report) | February 17, 2010 | 500 | ± 4.5% | 47% | 39% | 6% | 7% |
| WPRI (report) | March 9, 2010 | 600 | ± 4.0% | 47% | 32% | 6% | 7% |
| Rasmussen Reports (report) | March 16, 2010 | 500 | ± 4.5% | 49% | 40% | 3% | 9% |
| Public Policy Polling (report) | March 23, 2010 | 700 | ± 3.7% | 48% | 34% | — | 18% |

### Fundraising

Through December 31, 2010:
| Candidate (Party) | Net Receipts | Disbursements | Beginning Cash | Latest Cash On Hand | Debt |
| Russ Feingold (D) | $13,947,563 | $15,544,093 | $2,516,119 | $919,585 | $0 |
| Ron Johnson (R) | $15,509,297 | $15,316,651 | $0 | $192,646 | $8,708,465 |
| Source: Federal Election Commission ||||||

### Results

General election results :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Ron Johnson | 1,125,999 | 51.86% | +7.75% |
| | Democratic | Russ Feingold (incumbent) | 1,020,958 | 47.02% | −8.33% |
| | Constitution | Rob Taylor | 23,473 | 1.08% | N/A |
| | Write-in | Write-in | 901 | 0.04% | N/A |
| Total votes | Total votes | Total votes | 2,170,430 | 100.00% | -26.4% |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

#### Counties that flipped Democratic to Republican

* Barron (largest city: Rice Lake)
* Brown (largest city: Green Bay)
* Burnett (largest village: Grantsburg)
* Clark (largest city: Neillsville)
* Chippewa (largest city: Chippewa Falls)
* Iron (largest city: Hurley)
* Jefferson (largest city: Watertown)
* Kewaunee (largest city: Algoma)
* Langlade (largest city: Antigo)
* Manitowoc (largest city: Manitowoc)
* Marathon (largest city: Wausau)
* Monroe (largest city: Sparta)
* Oneida (largest city: Rhinelander)
* Outagamie (largest city: Appleton)
* Rusk (largest city: Ladysmith)
* Washburn (largest city: Spooner)
* Buffalo (largest city: Mondovi)
* Columbia (largest city: Portage)
* Door (largest city: Sturgeon Bay)
* Dunn (largest city: Menomonie)
* Forest (largest city: Crandon)
* Grant (largest city: Platteville)
* Jackson (largest city: Black River Falls)
* Juneau (largest city: Mauston)
* Kenosha (largest city: Kenosha)
* Lafayette (largest city: Darlington)
* Lincoln (largest city: Merrill)
* Pepin (largest city: Durand)
* Price (largest city: Park Falls)
* Racine (largest city: Racine)
* Richland (largest city: Richland Center)
* Sawyer (largest city: Hayward)
* Trempealeau (largest city: Arcadia)
* Winnebago (largest city: Oshkosh)
* Adams (largest city: Adams)
* Polk (Largest city: Amery)
* St. Croix (Largest city: Hudson)
* Taylor (Largest city: Medford)